I came across a news article saying that the Pew Research Center had this interactive income calculator to determine if a person is in the middle class.  It also compares the government data to the rest of the US population based on the metro area, number of household members and total household income level.

I live in the greater Los Angeles metro.  I was a bit surprised to find what the upper, middle and lower income cutoffs were.

In case the screenshot print is too small…

For 1 person household in the greater LA metro,  the cutoffs are: Lower < $30711 < Middle < $92135 < Upper.